Method and device for extracting a signal identifier, method and device for creating a database from signal identifiers and method and device for referencing a search time signal
First Claim
1. Method for extracting a signal identifier from a time signal having a harmonic portion, the method comprising:
- detecting (12) the temporal occurrence of signal edges in the time signal;
determining (14) a temporal interval between two selected detected signal edges;
calculating (16) a frequency value from the temporal interval determined, and associating the frequency value with a time of occurrence of the frequency value in the time signal to obtain a coordinate tuple from the frequency value and the time of occurrence for this frequency value; and
creating (18) the signal identifier from a plurality of coordinate tuples, each coordinate tuple including a frequency value and a time of occurrence, whereby the signal identifier includes a sequence of signal-identifier values which reflects the temporal form of the time signal.
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Abstract
In a method of extracting a signal identifier from a time signal, the temporal occurrence of signal edges in the time signal is detected (12), wherein a signal edge has a specified temporal length. In addition, the temporal interval between two selected detected signal edges is determined (14). From the temporal interval determined, a frequency value is calculated (16), the frequency value being associated with a time of occurrence of the frequency value in the time signal so as to obtain a coordinate tuple from the frequency value and the time of occurrence for this frequency value. A signal identifier is created from a plurality of coordinate tuples (18), each coordinate tuple including a frequency value and a time of occurrence, which is why the signal identifier includes a sequence of signal identifier values reproducing the temporal form of the time signal. The extracted signal identifier is based on signal edges of the time signal and thus reproduces the temporal form of the time signal. The signal identifier is therefore characteristic of the time signal, on the one hand, and robust towards changes in the time signal, on the other hand.
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Citations
22 Claims
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1. Method for extracting a signal identifier from a time signal having a harmonic portion, the method comprising:
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detecting (12) the temporal occurrence of signal edges in the time signal;
determining (14) a temporal interval between two selected detected signal edges;
calculating (16) a frequency value from the temporal interval determined, and associating the frequency value with a time of occurrence of the frequency value in the time signal to obtain a coordinate tuple from the frequency value and the time of occurrence for this frequency value; and
creating (18) the signal identifier from a plurality of coordinate tuples, each coordinate tuple including a frequency value and a time of occurrence, whereby the signal identifier includes a sequence of signal-identifier values which reflects the temporal form of the time signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22)
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20. Apparatus for extracting a signal identifier from a time signal having a harmonic portion, the apparatus comprising:
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means for detecting (12) the temporal occurrence of signal edges in the time signal;
means for determining (14) a temporal interval between two selected detected signal edges;
means for calculating (16) a frequency value from the temporal interval determined, and for associating the frequency value with a time of occurrence of the frequency value in the time signal to obtain a coordinate tuple from the frequency value and the time of occurrence for this frequency value; and
means for creating (18) the signal identifier from a plurality of coordinate tuples, each coordinate tuple including a frequency value and a time of occurrence, whereby the signal identifier includes a sequence of signal-identifier values which reflects the temporal form of the time signal.
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Specification